
I respect Jack Kirby, Steve Ditko, etc a lot, but I don't believe they were particularly fair to Lee. It also stands out that, on a personal level, I never found their post-Lee work to be all that great (Kirby did better then Ditko, but even his New Gods I think were done better by later writers). Two extremely talented guys, but I don't take them or people like Conway, whose opinion is no less subjective then theirs on the subject, all that seriously when it comes to Stan Lee. In the end, Lee is a person and as such probably did unfair things on occasion. He probably did intentionally take the spotlight, although part of that I think was just his personality and style making that easier. But, I'd still list him as the driving creative force on almost all the characters he's credited.
Now some characters, like the X-Men or She-Hulk (who he really just did one issue on so barely counts), really only work and stuck around because of later writers (the X-Men specifically would have died without other writers doing it better), but most of the characters Lee worked on succeeded and stuck around because of his work on them.
Anyway, this is a topic about Bob Kane, not Stan Lee. Last time I checked, stan Lee always mentioned the co-creators and never made a contract to specifically force Marvel to screw over people like Kirby or Ditko. Even if I agreed with your assessment of him, which I don't, Bob Kane would still be much, much worse then Stan Lee.